The main brake cylinder is used to initiate and control the braking action.
Main brake cylinders for brake systems incorporating drum brakes are fitted with a bottom valve to ensure a rapid brake response at short pedal travel.The bottom valve (1) ensures that the brake fluid contained in the brake system is constantly kept under a slight over pressure (pilot pressure 0.4 -1.7 bar pressure gauge reading) when the brake pedal is not operated so that the braking action will commence immediately when the brake pedal is depressed.
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Main brake cylinders for brake systems incorporating disc brakes are fitted with special bottom valves (bottom valve provided with throttle bore), as contrary to drum brake systems, no pilot pressure must exist in the brake system(pressure gauge reading 0 bar when the brake pedal is not operated).
To avoid any confusion between the two different brake cylinders,the main brake cylinders destined for disc brake systems are fitted with a metal or adhesive tape bearing the inscription
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